Final answer:
A composition that alternates between soft and loud dynamics is high in contrast, which refers to the opposition of elements to create interest in a piece. Loudness, measured in intensity level or decibels, contributes to the musical contrast and rhythm.
Step-by-step explanation:
A composition that alternates often between soft and loud dynamics can be said to be high in contrast. This term refers to the use of opposing elements, such as soft and loud dynamics, to create interest, variety, and drama in a piece of music or any other form of art. The loudness of sound is often described using terms such as intensity level or decibel, which measure the power of sound as perceived by the human ear.
When exploring contrast in music, it's essential to refer to Figure 5.4.9 and Figure 3.4.9, which demonstrate how visual artists use shapes, light, and shadows to create contrast. In much the same way, musicians use dynamic levels to create sonic contrast. Loudness difference in music can elicit emotional responses from listeners and contribute to the piece's overall rhythm and mood.